WorksheetsThermoplastics vs Thermosetting Plastics
Total questions: 20
Worksheet time: 15mins
What is a key characteristic of thermoplastics?
They cannot be reshaped once molded
They can be repeatedly melted and reshaped
They are very brittle
They decompose at low temperatures
Which of the following describes thermosetting plastics?
They soften when heated and can be reshaped
They harden permanently after curing
They are used primarily in low-temperature applications
They are easily recyclable
Which of the following is an example of a thermoplastic?
Polyethylene
Bakelite
Melamine
Urea-formaldehyde
Which plastic would be best for applications requiring high heat resistance?
Polyethylene
Polystyrene
Bakelite
Polyvinyl chloride (PVC)
What is the main advantage of thermoplastics in manufacturing?
They can be recycled and remolded
They resist melting at high temperatures
They are very rigid
They form permanent bonds when heated
Which of the following is a thermosetting plastic?
Polypropylene
Nylon
Epoxy resin
Polyethylene
Which characteristic is typical of thermosetting plastics?
They can be melted and reformed multiple times
They decompose upon heating instead of melting
They are usually soft and flexible
They dissolve in water
What type of polymerization typically forms thermosetting plastics?
Addition polymerization
Condensation polymerization
Copolymerization
Free-radical polymerization
Which of the following is an application of thermoplastics?
Circuit boards
Disposable containers
Brake linings
Electrical insulators
Which property makes thermosetting plastics ideal for electrical applications?
High thermal conductivity
High electrical conductivity
Excellent insulation properties
High flexibility
What happens to thermosetting plastics if heated after curing?
They melt
They soften
They burn or char
They dissolve
Which of the following is NOT a thermoplastic?
Polyvinyl chloride (PVC)
Nylon
Epoxy resin
Polypropylene
Polyethylene (PE) is commonly used to make which type of products?
Kitchenware
Electrical switches
Car dashboards
Brake pads
Which material is commonly used in kitchen countertops due to its durability and heat resistance?
Polyethylene
Bakelite
Polystyrene
Polyvinyl chloride
A plastic that can withstand high mechanical stress and temperature without deforming is most likely a:
Thermoplastic
Thermosetting plastic
Elastomer
Copolymer
What is the process called when a thermosetting plastic hardens permanently?
Melting
Curing
Crystallization
Decomposition
Which thermoplastic is widely used in the manufacturing of plastic bags?
Polystyrene
Polyethylene
Epoxy resin
Bakelite
Which of the following is an example of a commonly used thermosetting plastic in adhesives?
Polystyrene
Polyethylene
Epoxy resin
Polypropylene
Why are thermosetting plastics generally not recyclable?
They decompose into harmful chemicals
They are difficult to separate from other materials
They cannot be remolded or reshaped once set
They are too flexible
Which thermoplastic is commonly used for making beverage bottles?
Polyethylene terephthalate (PET)
Epoxy
Melamine
Bakelite
